Apparatus for and method of drawing glass



June 19, 1928.,

A. E. SPINASSE APPARATUS FOR AND METHOD OF DRAWING GLASS v e e g Lnal Filed Oct.

Ori

June 19, 1 928. 1,674,53U

A. E. SPINASSEI APPARATUS FOR AND METHOD OF DRAWING GLASS Original Filed Oct. 16, 1915 2 Sheets-Sheet 2 wuc mtoz attorney? Patented June 19, 1928.

PATENT OFFICE.

ARTHUR E. SPINASSE, F MOUNT VERNON, OHIO.

APPARATUS FOR AND METHOD OF DRAWING GLASS.

Original application filed October 16, 1915, Serial No. 56,184. Divided and this application filed February 11, 1920. Serial No. 357,984. Renewed April 15, 1926.

The invention relates to new and useful improvements in an apparatus for and method of drawing glass.

An object of the invention is to provide an apparatus of the above character wherein the shield for shielding the drawing area from the heat of the furnace is supported so that it may be shifted laterally relative to the segregating member which segregates the portion of glass from which the article is to be drawn for controlling the thickness of the walls of the article.

A further object of the invention is to provide an apparatus for drawing glass of the above character wherein the shifting of the shielding member is accomplished through the shifting laterally of the raising and lowering means therefor.

A further object of the invention is to provide a glass tank furnace of the above character with a. shielding member for shielding the drawing area, which shielding member is supported by means whereby the. same may be raised and lowered and held in a position above and adjacent the surface of the glass from which the article may be drawn.

A further objectof the invention is to provide an apparatus of the above character wherein means is provided for water cooling said shield.

A still further object ofthe invention is to provide an apparatus of the above charactor wherein said shield is raised from position "for drawing to a point above the hearth of the furnace and the opening through which the shield is raised and lowered and the article is drawn, is closed for reheating the glass for the next drawing operation.

A still further object of the invention is to provide a refractory shield. for use in connection with a glass furnace of the above character. which refractory shield may be sup orted by a water cooled hollow member, and wherein said shield and water cooled member are disposed above and adjacent the surface of the glass.

A still further object of the invention is to provide an apparatus of the above character wherein said water cooled member forms the lower edge of the shield.

A stillturther object of the invention is to provide a method of drawing glass articles wherein the shield for the drawing area is lowered into the drawing chamber and sustained therein with the lower edge there of above and adjacent the surface of the glass, and wherein a segregated body of molten glass is maintained beneath the shield from which the article is drawn, and wherein the shield is raised and the surface of the glass cleaned, after which the shield i? lowered for the drawing of another artic e.

These and other objects will in part be obvious and will in part be hereinafter more fully disclosed.

In the drawings which show by Way of illustration one embodiment of my invention:-

Figure 1 is a View in vertical section through a part of a glass tank furnace having my improvements applied thereto;

Fig. 2 is a plan view of the raising and lowering means for the shield;

Fig. 3 is a side View of the raising and lowering means;

' Fl d is a view showing a portion of the heart the molten glass below the hearth, the shield raised from the drawing chamber, and the opening covered for the reheati-n oi the glass beneath the same for the next rawing operation; and

Fig. 5 is a detail, showing in section. a modified form of shield. And Figure 6 is a vertical section taken through a further slightly modified tormof the invention.

The invention from its broadest aspects is directed to a glass tank furnace which is preferably constructed with the drawing chamber at one side thereof, which is covered by the usual hearth having an opening through which the bait is introduced into the molten glass for drawing the glass article. Associated with the means for drawing the article is a shield which maybe wholly, or in part of refractory material, or which may be of metal provided with water cooling means, and this shield is so proportioned that it may be raised and lowered through the opening. Means is provided for supporting said shield whereby it may be raised and lowered and this supporting means includes a carriage with which means is associated whereby said carriage may be shifted laterally in any desired direction so as to shift the shield supported thereby laterally relatively to the glass article being drawn so as to control the thickness and form of the glass article. In the case of a refractory ring shield and when drawing a glass article, the shield will be shifted so as to provide a greater air space on one side than the other,

- and thus the temperature is lowered at said greater air space, resulting in a thickening of the wall at this side of the cylinder, and also in the thinning of the wall on the other side of'the cylinderwhere the temperature is increased through the decreasing of the air space. In case of a water cooled shield, then as the shield approaches the cylinder on one side thereof, the cooling efi'ect of the shield is the reverse of that above described, that is to say, as the shield moves toward the side of the cylinder, decreasing the space between the shield and the glass cylinder, the wall of the glass cylinder at this section will be cooled to a greater extent by radiation from said water cooled shield and thus thickened. This is brought about by the reason of the fact that the cooling effect of the water cooled shield is greater than the cooling effect of the increased air space on the other side produced by the shifting of the shield.

The supporting means for the shield is constructed so as to raise and lower the shield through the opening in the hearth as above noted, and in operation, the shield is lowered so that the lower edge thereof is above and adjacent the surface of the glass. Disposed in the molten glass is a refractory member which maintains a segregated portion of the glass from which the glass article is drawn. This segregating refractory member may be wholly submerged in the molten glass or partly immersed therein. Said refractory member is centered relative to the drawingmeans and is held in a predetermined position preferably by adjustable means so that it may be shifted vertically as desired. My improved method from the broad aspect, consists in lowering a shield of the character above described into the drawing chamber of the glass tank furnace to a position so that the lower edge thereof is above and adjacent the surface of the glass during drawing, maintaining a segregated body of molten glass with its surfcae unbroken, drawing the article upwardly from said segregated body of glass and through said shield. After the article has been drawn, then raising the shield and cleaning the surface of the glass and lowering the shield for another drawing operation. The shield may be raised to a point above the top of the furnace and the opening in the hearth closed by a suitable covering so as to confine the furnace heat and exclude the cooling air whereby to reheat and restore the segregated glass to proper drawing temperature, after which the cover is removed and the shield lowered for the next drawing operation.

The present application is a division of my prior application, filed October 16, 1915, Serial Number 56,184 and on which Patent No. 1,336,056, was granted April 6, 1920, and reference may be had thereto for a more detail disclosure of the particular type of furnace to which may invention is applied. In the present illustrated embodiment of the invention, I have shown an apparatus for drawing glass cylinders, and the furnace is provided with a hearth, indicated at 1, and beneath this hearth is the molten glass M. Said hearth is provided with an opening 2 through which the glass cylinder indicated at C in the drawings is drawn. The cylinder is drawn by means of a bait 8 which is mounted in any suitable way and which is lowered through the opening and attached to the body of glass for the drawing operation. A portion of the molten glass is segregated by means of a refractory member 4. This refractory member 4 as shown in detail in Fig. 1, is in the form of a dishshaped disk with its pper face concave, and with an opening 5 centrally thereof through which the glass may pass upwardly into the segregated area formed by said refractory member. The submerged ring 4 below may form an anchorage for the glass flowing therein through opening 5. From certain aspects of the invention, this refractory segregating member may be in the form of a ring as shown in Fig. 5, or it may be in any desired shape, the essential feature consisting in the segregating of a mass of glass from the main body of glass in the tank, from which said segregated mass the glass article is to be drawn. As a means for holding said refractory ring in predetermined positions, I have provided two or more re fractory rods 6, 6 which extend vertically through openings 7 7 in the hearth and which are adapted to engage in suitable recesses 8, 8 formed respectively in ears 9, '9 extending laterally from the body portion of the refractory-segregating member. These recesses may be omitted if desired. The means for supporting these refractory rods 6, 6 at each sideof the drawing opening is similar in construction and the description of one set of devices for this purpose will answer for both. Mounted in a suitable bracket 10 is a vertically sliding rod 11 which has a socket piece 12 adapted to engage the upper end of the refractory rod 6. This provides a ready means whereby the rods 6, 6 may be replaced from time to time. The vertically slidin rods 11 are provided with a pin 13 adapte to engage in a slot 14: in a bell crank lever 15. A link 16 is pivoted to the other end of the bell crank lever and in turn is pivoted to a bell crank lever 17.

or rectangular.

This bell crank lever 17 is connected to a rod 18 which is provided with suitable means 19 adapted to counterbalance the weight of the part which is to be shifted. Said rod 18 is held in Various vertically adjustable poitions by means of a pin adapted to pass through one of the openings 20. which pin extends into a suitable opening in a bracket 21. From the above description it will be apparent that the refractory rod 6 may be raised and lowered readily and may be fixed in any desired adjusted position. This vertical adjustment of the rods 6, 6 will vary the position of the refractory member engaged thereby. It is understood of course, that this refractory member floats in the molten glass and is thereby held in contact with the ends of the refractory rods. These refractory rods, as above noted, serve to position the refractory. member and by adjusting this refractory member in the molten glass, the amount of glass segregated may be varied and the fluidity of the glass in the segregated area controlled.

Associated with the drawing bait 3 and the segregating member 4 is a shield 22 which shields the article being drawn from the heat of the furnace. As shown in F igures 1 and 4, this shield is in the form of a refractory ring 23 supported by a hollow metal member 24. It is understood of course that this refractory shield 23 may be otherwise shaped to suit the article being drawn as, forexample, it may be oblong I The hollow metal member extends below thesurface of the refractory material and 'the refractory material engages the upper and side portions of said hollow metal member. Pipes 25, 25 extend through the refractory ring and serve the double function of supporting the hollow metal member and of supplying a cooling fluid, such as water, to said hollow member. The opening 2 in the furnace is larger in diameter than the maximum diameter of the shield so that the shield may be readily raised and lowered through said opening, and also for the purpose of permitting said shield to be shifted laterally relatively to the bait 3 and the refractory member 4, which are centered relative to each other. The means for rais ng and lowering the shield and for shifting it laterally as shown in the drawings consists of suitable cables 26, 26 which are attached to the water pipes 25, 25 and raise and lower said water pipes, it being understood thatthese water pipes are in turn connected to flexible pipes so a to permit them to be readily raised and lowered. As shown in the drawings, there are four cables. These cables run respectively over guiding pulleys 27 mounted on a carriage 28. Two of the cables are connected with a drum 29 on a shaft 30, the other two are connected with a drum 31. This shaft the cables will be wound on to the drums 30 and 31 and the shield raised and of course, when the motor is turned to the other direction, the shield will be lowered. This serves as a very ready means for raising and lowering the shield so that it may be positioned with the lower edge of the shield just the right distance above the surface of the molten glass in the drawing chamber. It is Well known in practice that it is desirable to shut off as far as possible the heat effects of the main furnace on the article being drawn. By my arrangement of shield, Where the lower edge is very close, but still above the surface of the glass, the article being drawn is practically shielded from direct influence of'the heat in the furnace. At the same time, where the shield is above the surface of the glass, the shield itself is not subjected to the deteriorating effects thereon through contact with the molten glass, andfurthermore, the glass is not subjected to any injurious effects through contact with the shield. Of course, the above particularly applies when the shield is used in connection wit-h a submerged refractory ring. If, however, the refractory ring is not entirely submerged, then of course, the shield will be lowered to apoint closely adjacent the refractory ring; still it is desirable to support said shield free from contaet and engagement with the refractory ring so that the'shield may be readily shifted laterally without many way disturbing the'refractory segregating member. The above means for vertically raising and lowering the shield provides for not only the quick accomplishing of this raising and lowering, but it also provides the ready means for setting the shield so that it will be in just the right position relative to the surface of the molten glass, which of course varies according to the quantity of glass in the furnace.

As a means for shifting the shield laterally, I have provided supporting beams 35 on which the carriage 28 is mounted so that it may be moved freely in any direction. A threaded shaft 36 engages a bracket 37 attached to said carriage 28 and this bracket permits the shaft to be freely rotated, but any endwise movement of the shaft will move the carriage in a direction parallel with the supporting beams therefor. This shaft 36 may be turned by a suitable hand wheel 3801' in any other Way. The'shaft 36 engages a nut in a fixed cross beam 39 so that as the shaft is turned it must neces sarily move endwise in said nut and thus impart movement to the carriage. A slmilar shaft- 40 engages the bracket 41 connected to the carriage 28 and is turned by a hand wheel 42. This shaft provides for adjustment at right angles to the length of the beam 35. Through the two adjustments at right angles to each other, the lateral shifting of the shield in any direction may be obtained.

As clearly shown in Fig. 4 of the drawings, a suitable lid or cover 43 is provided for closing the opening 2 in the hearth. This lid is carried by suitable cables or chains 44, 44.

In the form of shield shown in Figures 1 and 4, the hollow water cooled metal member forms the lower face of the shield. It is well known that refractory rings often warp when subjected to intense heat, and also that said rings are liable to break or crumble. By this construction of shield wherein the hollow metal member forms the lower edge thereof, all liability of warping is avoided and a continuous unbroken edge is formed substantially all the way around the glass article being drawn, so as to perfectly shield the same. In place of a refractory ring and water cooled supporting member therefor, I may, if desired, form my shield entirely of metal as shown in Fig. 5. In this form of shield, there is a hollow chamber 45 which substantially conforms in cross section to the cross sectional shape of the ring. The ring is supported by suitable water pipes 25, 25 through which water is supplied to the hollow chamber 45 for cooling the ring.

From the broad aspect of the invention,

the shield may be made in various otherforms, as, for example, in drawing glass sheets or plates, the shield or segregating ring may be rectangular or elongated in form rather than circular as when drawing a glass cylinder. The ring shield also, instead of being in one continuous piece, may be in sections. The essential feature consists in a member which shall shield the article being drawn from the heat of the furnace and which shield has a definite position relative to the surface of the molten glass on the one hand, and which shield, on the other hand, is supported by means which permits it to be readily raised and lowered and shifted laterally relatively to the glass article being drawn and independently of the segregating member.

The method forming my present-invention consists particularly in the steps of forming a glass article preferably a glass cylinder, which steps may be carried out by the apparatus specifically described above, and a description of the apparatus will make clear the steps .of the method.

The segregating refractory member 4 is positioned for maintaining the segregated mass of molten glass in proper condition as to fluidity for drawing the article therefrom.

The cover to the opening in the hearth is removed and the shield is lowered therethrough'to a position above and adjacent the surface of the glass. The bait is then lowered through the shield and the article drawn from the segregated mass of glass upwardly sirable to reheat the segregated mass of" glass from which the drawing is'efi'ected, then the shield is raised entirely above the hearth and the cover is placed in the opening to close the same, thus confining the furnace heat and excluding cooling air from the furnace. This frees the drawing area above the glass and beneath the lid from any obstructing members so as to greatly facilitate the reheating and at the same time, with draws the shield from the intense heat and thus protects the shield during this reheating. This greatly reduces the period of time between drawing operations. Furthermore, the withdrawing of the shield from the furnace during reheating greatly increases the life of the shield and permits the use, if desired, of a hollow metal water cooled chilling shield.

In Figure 6, I show a shield member 5 with its lower portion above the bath lowered near the surface of the glass 86 but not in contact therewith. It is brought to just the point where it prevents excess transfer of heat by absorption of the ring. In this case refractory member 87 is submerged in position with its upper portion spaced beneath the surface of the bath, and segregates a layer of cooler glass thereabove from which the base of the article is to be drawn as in the case of submerged member 4 in Figure 1.

It is obvious that various changes in the details of construction and the arrangement of the parts may be made without departing from the spirit of the invention as set forth in the appended claims.

Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is

1. In a glass drawing tank furnace, a glass segregating device, means for maintaining said segregating device in submerged position with its upper edge beneath the surface of the glass adjacent the drawing area, a

shield for shielding the drawing area, and

means for supporting said shield with the lower edge thereof spaced above and adsurface of the glass during. drawshield for shielding the drawing area, and

means for supporting said shield with the lower edge thereof spaced above the glass and above the refractory member during drawing, said shield being unconnected with said refractory member so that the surface of the glass within said refractory member and adjacent the upper edge thereof is substantially "unbroken.

4. In a glass drawing tank furnace, a refractory member, means for maintaining said refractory member in submerged position with its upper edge beneath the glass surface at the drawing area, a shield for shielding the drawing area, and means for supporting said shield with the lower edge thereof spaced above the surface of the glass, said supporting means including devices whereby the shield may be raised or lowered to desired position with respect to the drawing area during drawin 5. In a glass drawing furnace, a shield for shielding the drawing area, means for supporting said shield with the lower edge thereof spaced above the surface of the glass, said supporting means including devices whereby the shield may be adjusted to desired position, a refractory segregating member, and means for maintaining said member submerged with its upper edge beneath the surface of the glass, said means including devices whereby said segregating member may be shifted to vary the depth thereof beneath thesurface of the glass.

6. In a glass drawing tank furnace, a shielding device, and means for supporting said shielding device whereby the same may be positioned in the drawing chamber of the tank, and means whereby said shield may be shifted laterally to desired position with respect to the drawing area during drawing.

7. In a glass drawing tank furnace, a shielding device, and means for supporting said shielding device in position in the drawing chamber of the tank, said supporting means including devices whereby the shield may be moved bodily vertically and laterally to desired position with respect to the drawing area during drawing.

8. In a glass drawing tank furnace, a.

shielding device, means for supporting said shielding device in position in the drawing chamber out of contact with the drawn glass, said supporting means including devices whereby the shield may be shifted bodily laterally to desired position with respect to the drawing area during drawing.

9. In a glass drawing tank furnace,.a. shielding device, and means for supporting said shielding device in position in the drawing chamber of the tank and with its lower edge spaced above and adjacent the surface of the glass, said means 'ncluding devices whereby the shield may be shifted vertically and laterally to desired position with respect to the drawing area during drawing.

10. In a glass drawing tank furnace, a refractory member, means for maintaining said refractory member in submerged position with its upper edge beneath the glass surface at the drawing area, a shield for shielding the drawing area, and means for supporting the shield with the lower edge thereof spaced above the surface of the glass, said supporting means including devices whereby the shield may be shifted laterally with respect to the drawing area during drawing.

1.111 a glass drawing tank furnace, a shield for shielding the drawing area, a carriage, means mounted on the carriage for supporting the shield and for raising and lowering thesame, and means for shifting the carriage for shifting the shield laterally of the drawing area and during drawing.

12. In a glass drawing tank furnace, a shield for shielding the drawing area, a carriage, means mounted on the carriage for supporting the shield and for raising and lowering the same, means for shifting the carriage laterally in one direction relative to the drawing member, and means for shifting the carriage laterally in a direction at right angles thereof whereby through said shifting means said shield may be moved laterally in any direction relative to the drawing area and during drawing.

13. In a glass drawing tank furnace, a shield for shielding the article being drawn, a carriage, means mounted on the carriage for supporting said shield, said means including devices connected to the shield for raising and lowering the same, and means whereby the carriage may be shifted laterally in directions at right angles to each other relative to a vertical line passing centrally through the shield whereby the shield may be shifted laterally in any direction relative to the drawing area and during drawing.

14. In a glass drawing tank furnace, a refractory member, means for maintalning said refractory member submerged Wlth its upper edge adjacent the surface of the glass of the drawing area, said maintaining means including devices whereby the position of the refractory member ma be shifted vertically, a shield for shiel 'ng the drawing area, and means for supporting said shield with the lower edge thereof above the surface of the glass, said supporting means including a carriage shiftable laterally in directions at right angles to each other whereby the shield may be shifted in any lateral direction relative to the article being drawn.

15. The method of drawing glass articles which consists in maintaining asegregated body of molten glass of a suitable depth for drawing, and with the surface thereof throughout the segregated mass, and adjacent thereto, substantially unbroken, shielding the drawn area in said segregated body of glass, and drawing the article from said segregated portion upwardly through said shield.

16. The method of drawing glass articles which consists in maintaining a segregated body of molten glass of a suitable depth for drawing, and with the surface thereof throughout the segregated mass',"and adjacent thereto, substantially unbroken, shielding the drawn area in-said segregated body of glass, and drawing the article from said segregated portion upwardly through said shield, raising the mass for shielding the drawing area, cleaning the surface of the glass, and then lowering the shield''and drawing another article from the -segregated body of molten glass.

17. The method of drawing glass articles which consists in segregating a body of molten glass while maintaining the surface of the segregated portion, and the surface of the glass adjacent thereto, substantially unbroken, and drawing the glass articles from said segregated body of glass.

18. The method of drawing a glass article from a bath of molten glassin a furnace, which consists in drawing the article from a substantially unbroken surface portion of the glass bath lying adjacent to a wholly submerged refractory means and from the glass lying 'within heat shielding means spaced above the working level of the glass.

19. The method of drawing glass articles which consists in segregating a body of molten glass while maintainin the surface of the segregated portion, an the surface of the glass adjacent thereto, substantially unbroken, shielding the drawing area from a point above the surface of the glass, and drawing a glass article from. the segregated portion of the glass upwardly through said shielded zone.

20. In a glass drawing tank furnace, a shield for the drawing area, means for supporting said shield with its lower edge above the surface ofthe glass, a refractorymember,--means for maintaining said member submerged with its upper edge beneath the surface of the glass adjacent to but in spaced relation .to the base of the drawn article.

21. In an apparatus for drawing glass articles from a bath of molten glass in a furnace, a refractory segregating member located in the molten glass and at a predetermined distance beneath the working surface of the glass, means for shielding the drawing area, means for supporting said shielding means with the lower edge thereof above the surface of the glass, means for drawing a glass article from the molten glass through the shielding means, and means for shifting said shielding means independently of the segregating means.

22. In apparatus for drawing glass cylinders, sheets or like articles from a bath of molten glass, a. segregating means submerged within the bath, and shielding means for the drawnarticle disposed in spaced relation above the bath to leave substantially free and uninterrupted the surface of the bath between said segregating means, shielding means and the source of the drawn article.

23. In apparatus for drawing glass cylinders, sheets or like articles from a bath of molten glass, a segregating member within the bath having its upper portion in spaced relation below the surface level of the glass bath adj acentthe base of the drawn article, and a shield for the drawn article in spaced relation adjacent the forming Walls of the drawn article, said shield having its lower portion in spaced relation above the surface level of the bath to provide a substantially free and uninterrupted space between said shield, the surface of the bath and the adjacent walls of the drawn article.

24. An apparatus for drawing glass articles comprising a shieldin device surrounding the drawn article sIightly above, its source, and means to support the shielding device and to shift said device laterally during drawing with respect to the article to compensate or varying temperature conditions.

25. In apparatus for drawing glass cylinders, sheet or like articles from a bath of molten lass, a shield adjacent the drawn article slightly above its source, and supporting means for the shield which admits bodily movement of the shield in a horizontal plane during drawing and in constant parallel relation with the surface level of the bath.

26. In apparatus for drawing glass cylinders, sheets or like articles from a bath of molten glass, a receptacle for containing the glass from which to draw the article, a cooler means wholly spaced above the surface level of the bath adjacent the forming walls of the drawn article, a carriage member having means supporting said cooler at various distance above the surface of the. bath, and means for laterally shifting said carriage and cooler in a horizontal plane with respect to the forming walls of the drawn article.

27. In apparatus for drawing glass cylinders, sheets or like articles from a bath of molten glass, a receptacle for containing the glass from which to draw the article, cooler means disposed in spaced relation above the surface of the bath adjacent the drawn article, and laterally shiftable supporting means for said cooler means which admits bodily movements of said cooler means in horizontal directions angular to one another.

28. In apparatus for drawing cylinders, sheets or like articles, a receptacle for containing a pool of molten glass from which to draw the article, a device for drawing the article from said pool of glass, cooler means in spaced relation above the surface of the pool adjacent the forming walls of the drawn article, and means operable for horizontally shifting said cooler means so as to bring any desired portion of said cooler means in any desired spaced cooling position with respect to desired local portion of the forming walls of the drawn article to compensate for varying drawing conditions in the walls of said drawn article during drawing.

29. The method of drawing glass cylinders, sheets or like articles from a bath of molten glass in a furnace wherein the draw is made from a portion of the bath which is above a submerged anchoring member, the step which consists in shielding the drawn article by maintaining a shielding means in proximity to the forming walls of the drawn article and with the lower portion of the shield in spaced relationabove the surface of thebathto leave the surface of the bath free and uninterrupted between the lower portion of said shielding means, anchoring member and the source of the drawn article.

30. The method of drawing glass articles from a bath of molten glass, which consists in segregating a ortion of cooler glass from the main body oi molten lass by maintainin a segregatin mem er substantially wl olly submerged fieneath the surface of the glass adjacent the drawing source, and shielding the article drawn from such portion of the glass from the furnace heat by maintaining a shielding member adjacent to the article and wholly spaced above the surface of the bath to leave free and substantially uninterrupted the surface of the bath between said segre ating andshielding member and the base of the drawn article.

31. The method of drawing glass articles from a bath of molten glass, which consists in segregatin a portion of cooler glass from the main bo y of molten glass by maintaining a glass segregating member substantially wholly submerged beneath the surface of'the bath adjacent the source of the drawn article, and cooling thelarticlebeing drawn from such portion of the bath by maintaining cooling means adjacent to said drawn article and out of contact with the glass surface of the batln 32. The method of drawing a lass article from a bath of molten glass w ich consists in drawing the article from the molten glass within shielding means and shifting said shielding means in a horizontal plane relative to the article for varying the temperature conditions of one portion of the article bein drawn relative to the other portion thereof 33. The method of drawing a glass article from a bath of molten glass whlch consists in drawing the article from the molten glass from within fluid-cooled shielding means and shifting said shielding means in a horizontal plane relative to the article for varying the temperature conditions of one portion of the article being drawn relative to the other portions thereof.

34. In a glass drawing tank containing a bath of molten glass, a segregating devlce, means for maintaining said segregating device entirely submerged within the bath below the base of the article being drawn, whereby .to provide a segregated pool of glass at the drawing zone with the surface of the pool extending in substantially uninterrupted continuity with and at the level of the surface of the remainder of the bath outside the pool, and means for drawing a glass article from such segregated pool of glass.

35. That process of drawing glass cylinders, sheets and like articles from abath of molten glass, which consists in segregating a portion of the surface layer of the bath, and drawing the article from-said segregated portion with the surface layer about the article being drawn substantially free and unbroken throughout the entire extent of the segregated portions.

36. In apparatus 'for drawing glass cylinders, sheets and like articles from a bath of molten glass, a segregating device, and means for holding said device entirely submerged within the bath below the base of the article being drawn and in position to provide a segregated surface layer of the molten glass substantially free and unbroken and extending over the entire area of the submerged segregating device, and from which the article may be drawn.

37. In apparatus for drawin glass c linders, sheets and like articles ii-om a of molten glass, a se egating device, and means for holding sai device entirely submerged within the bath below the base of the article being drawn and in position to provide a segregated surface layer of the molten glass substantially free and unbroken ath and extending over the entire area of the submerged segregating device from which the article may be drawn, said holding means being adjustable for varying the depth of submergence of the segregating device to regulate the depth of the said surface layer of the molten glass.

38. In apparatus for drawing glass cyliuders, sheets and like articles from a bath of molten glass. a. segregating device, and means for holding said device entirely slll) merged within the bath below the base of the article being drawn and in position to provide a segregated surface layer of the molten glass substantially free and unbroken and extending over the entire area of the submerged segregating device and from which the article may be drawn, said segregating device lying beneath and coextensive with the base of the article being drawn and having a depression in its upper surface and further having a configuration corresponding substantially to that of the base of the article being drawn.

39. In apparatus for drawing glass cylinders, sheets and like articles from a bath of molten glass, a segregating device, and means for holding said device entirely submerged within the bath below the base of the article being drawn and in position to provide a segregated surface layer of the molten glass substantially free and unbroken and extending over the entire area of the subn'ierged segregating device from which the article may be drawn, said segregating device having a continuous and enclosing body for the glass beneath and providing anchoring means for the glass beneath the base of the article being drawn.

4-0. In apparatus for drawing glass cylinders. sheets and like articles from a bath of molten glass. a segregating device, means for holding said device entirely submerged within thebath below the base of the article being drawn and in position to provide a segregated surface'layer of the molten glass substantially free and unbroken and extending over the entire area of the submerged segregating device and from which the article may be drawn, cooling means disposed about the article being drawn, and means for supporting the cooling means with the lower portion thereof spaced above the surface of the bath.

41. In an apparatus for drawing glass cylinders, sheets and other glass articles from a bath of molten glass, the combination of a segregating device adapted to be submerged wholly beneath and in spaced relation to the surface level of the bath to leave the surface of the bath substantially free and unbroken throughout the length and width of the segregating device, and shielding means arranged above the bath in register with the segregating device and having the lower portions thereof spaced above the free and unbroken surface of the bath.

42'. In an apparatus for drawing glass cylinders, sheets and other glass articles from a bath of molten glass, the combination of a segregating device, shielding means spaced above the segregating device and in register therewith, and means for holding the segregating device and the shielding means with respect to a bath of molten glass with the lower portions of the shielding means slightly spaced above the surface level of the bath and the segregating device spaced slightly below said surface level of the bath to leave the surface level of the bath at the drawing area substantially free and unbroken between and throughout the entire extent of the shielding means and the segregating device.

43. In apparatus for drawing glass cylinders, sheets and like articles from an exposed area in a bath of molten glass, a drawing receptacle for containng a bath of molten glass considerably larger than said area and having the entire surface of the area which is exposed for drawing substantially wholly unbroken and continuous with the glass of the bath outside said area and extending within said tank, a glass segregating device, means for maintaining said device entirely submerged within the bath below the base of the article being drawn from said area, and means for drawing the article from said area.

In testimony whereof, I aflix my signature.

ARTHUR E. SPTNA SSE. 

